CN202216393U - Air-passage-resistance-free safe energy-saving air heater - Google Patents
Air-passage-resistance-free safe energy-saving air heater Download PDFInfo
- Publication number
- CN202216393U CN202216393U CN201120263493XU CN201120263493U CN202216393U CN 202216393 U CN202216393 U CN 202216393U CN 201120263493X U CN201120263493X U CN 201120263493XU CN 201120263493 U CN201120263493 U CN 201120263493U CN 202216393 U CN202216393 U CN 202216393U
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- heater
- saving
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Abstract
The utility model discloses an air-passage-resistance-free safe energy-saving air heater, which comprises air pre-heater, a cold primary air passage, a hot primary air passage, a secondary cold air passage, a secondary hot air passage, a cold flue and a hot flue, wherein electric heating devices used for raising the air temperature during the boiler cold-state starting are arranged in the hot primary air passage and the secondary hot air passage. The air-passage-resistance-free safe energy-saving air heater has the advantages that the structure is reasonable, more stable and reliable heating inlet air temperature than that of the traditional air heater can be obtained, and the moisture condensation corrosion blockage of the tail part of a boiler is avoided. The air-passage-resistance-free safe energy-saving air heater has the greater beneficial effects that: the defects of the traditional air heater in the use process are overcome, and the electricity saving, oil saving and coal saving effects are obvious. The air-passage-resistance-free safe energy-saving air heater belongs to an indispensable technical improvement item for long-period safe and efficient operation of the boiler and has low investment, high yield is high, low maintenance quantity and good heating performance.
Description
Technical field
The utility model relates to a kind of heater.
Background technology
Large electric power plant unit (more than the 300MW) boiler air and flue system blower fan power consumption accounts for installed capacity about 1%.In same new installation unit air and flue system power consumption and operation air and flue system power consumption contrast after 1 year, difference is very big, and its reason is that the air preheater resistance increases relevant with the steam air heater resistance.The forward and backward parameter comparison of major overhaul, because of the air preheater change in resistance, in the 6000V motor, the air-introduced machine electric current rises to 108/111A from 95/97A; Pressure fan also increases the dirty resistance of steam air heater fin and increases double influence, and the pressure fan electric current rises to 42/44A from 31/33A.The primary air fan electric current increases more than the 10A equally.
Present most of boiler of power plant stops up for preventing the air preheater dewing corrosion; Particularly still improve air preheater cold junction mean temperature winter with the steam heating type steam air heater; Sulphur composition in the strick precaution flue gas is because of the dirty heat transfer element of dewfall, and air preheater wind and smoke passage is also stopped up in corrosion.They understand, if air preheater descends heat-transfer effect because of the low dewing corrosion of cold junction temperature stops up; Air leak rate of air curtain increases; Its thermal efficiency reduces significantly, and boiler combustion, blower fan (pressure fan, air-introduced machine, primary air fan) electric current increase, and it is limited to exert oneself; Generating set coal consumption, power consumption increase, and the steam air heater direct losses are bigger than not coming into operation.
The come into operation negative effect of traditional steam air heater of analysis: the one, steam air heater is operated in the big especially zone of the carbonated drink temperature difference; Hydrophobic, insulation many because of pipe bending such as is not good at influence; Forming carbonated drink resonance, is to leak main cause winter, finally be isolation processing not and out of service; The 2nd, the obstructed Steam Heating wind-warm syndrome of steam air heater in summer, but winged insect and foreign material obstruction that fin carries because of fans entrance, duct resistance increases severely, and equally blower fan is exerted oneself and the influence of electric current formation.
Summary of the invention
It is a kind of rational in infrastructure that the purpose of the utility model is to provide, the no air channel resistance energy-saving safe heater that heating properties is good.
The technical solution of the utility model is:
A kind of no air channel resistance energy-saving safe heater; Comprise air preheater, a cold air channel, heat primary air road, secondary cold air duct, secondary hot-air road, cold smoke road, heating flue, it is characterized in that: in heat primary air road and secondary hot-air road, be provided for the electric heater unit that boiler cold-state starts the heating wind-warm syndrome.
Between the pressure fan inlet of secondary hot-air road and secondary cold air duct, the return airway is set, the diameter of return airway is less than the hot and cold air channel of secondary diameter; Air-valve by the cold wind temperature and the air preheater outlet cold flue gas temperature average decision aperture size of air preheater cold side inlet is set on the return airway.
In the secondary cold air duct and in the cold smoke road, temperature point is set.
The utility model is rational in infrastructure, can obtain than the more reliable and stable heating import of traditional steam air heater wind-warm syndrome, avoids the boiler tail dewing corrosion to stop up; Bigger results are to eliminate the deficiency that traditional steam air heater exists in using, and economize on electricity, fuel-economizing, economize on coal that it is outstanding to manifest, and are reduced investments; Income is high; Maintenance is little, and heating properties is good, is the indispensable technological transformation project of boiler long period safe and highly efficient operation.
The utility model is used for boiler, and normally to move heating blower inlet cold wind be to extract thermal source from air preheater outlet hot-flow flue, thereby avoided the resistance of the steam surface heating steam air heater in the air channel.Add small-bore return airway at air preheater outlet hot-flow flue and pressure fan inlet; The pitch of regulating the wind flow size is housed in the return airway; Air preheater inlet air channel and flue are equipped with temperature point respectively, with cold junction wind-warm syndrome, cigarette temperature mean value size decision backflow hot blast pitch size aperture; Also combine coal-fired sulfur content size to revise.When coal-fired sulfur-bearing less than 1.5% the time, the cold junction mean temperature is set 68 ℃.Be that the import wind-warm syndrome adds exhaust gas temperature greater than 136 ℃, can avoid air preheater heating surface dewing corrosion and stop up.When coal-fired sulfur-bearing less than 2%～greater than 1.5% the time, the cold junction mean temperature is set 72 ℃, i.e. import wind-warm syndrome adds exhaust gas temperature and can avoid the smoke condensation corrosion to stop up greater than 144 ℃.Uncertain because of the boiler fired coal sulfur-bearing, sulfur content increases in the coal, and sulfur-containing smoke gas set point temperature is also along with improve, and the cold junction mean temperature is controlled also along with raising.Hot blast recirculation can in time be adjusted setting according to cold junction temperature and coal-fired sulfur-bearing situation, for boiler safety efficiently provides safeguard.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the utility model is described further.
Fig. 1 is the structural representation of an embodiment of the utility model.
The specific embodiment
A kind of no air channel resistance energy-saving safe heater; Comprise air preheater 1, a cold air channel 13, heat primary air road 14, secondary cold air duct 7, secondary hot-air road 8, cold smoke road 9, heating flue 10, in heat primary air road and secondary hot-air road, be provided for the electric heater unit 5,15 that boiler cold-state starts the heating wind-warm syndrome respectively.
Between pressure fan 2 inlets 6 of secondary hot-air road and secondary cold air duct, return airway 3 is set, the diameter of return airway is less than the hot and cold air channel of secondary diameter; Air-valve 4 by the cold wind temperature and the air preheater outlet cold flue gas temperature average decision aperture size of air preheater cold side inlet is set on the return airway.
One more blower fan 16. among the figure
In the secondary cold air duct and in the cold smoke road, temperature point 11,12 is set respectively.
During the utility model work, when the no thermal source of boiler cold-state startup self, heating furnace import wind-warm syndrome is by being installed in each electric heater unit 5 (15) of number in the hot-flow flue, and heating gets into the burner hearth combustion air.When boiler furnace inlet wind-warm syndrome reaches more than 150 ℃, can throw coal dust firing, reduce ignition of the boiler with oil.After treating that boiler throwing powder is normal, the electrical heating wind-warm syndrome device of stopping using changes normal operating mode over to.
Boiler is normally in service, and air-valve 4 aperture sizes are by air preheater cold side inlet (being the secondary cold air duct) cold wind temperature and the decision of air preheater outlet cold flue gas temperature average.The air preheater that makes is operated under the normal temperature control, thereby realizes boiler long period safe and highly efficient operation.Realize boiler economize on electricity, fuel-economizing, economize on coal, the purpose of synergy, cater to current society to the energy-saving and cost-reducing transformation demand of energy consumption equipment.
Claims (3)
1. no air channel resistance energy-saving safe heater; Comprise air preheater, a cold air channel, heat primary air road, secondary cold air duct, secondary hot-air road, cold smoke road, heating flue, it is characterized in that: in heat primary air road and secondary hot-air road, be provided for the electric heater unit that boiler cold-state starts the heating wind-warm syndrome.
2. no air channel according to claim 1 resistance energy-saving safe heater is characterized in that: between the pressure fan inlet of secondary hot-air road and secondary cold air duct, the return airway is set, the diameter of return airway is less than the hot and cold air channel of secondary diameter; Air-valve by the cold wind temperature and the air preheater outlet cold flue gas temperature average decision aperture size of air preheater cold side inlet is set on the return airway.
3. no air channel according to claim 1 and 2 resistance energy-saving safe heater is characterized in that: in the secondary cold air duct and in the cold smoke road, temperature point is set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120263493XU CN202216393U (en) | 2011-07-25 | 2011-07-25 | Air-passage-resistance-free safe energy-saving air heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120263493XU CN202216393U (en) | 2011-07-25 | 2011-07-25 | Air-passage-resistance-free safe energy-saving air heater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202216393U true CN202216393U (en) | 2012-05-09 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120263493XU Expired - Fee Related CN202216393U (en) | 2011-07-25 | 2011-07-25 | Air-passage-resistance-free safe energy-saving air heater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202216393U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102287912A (en) * | 2011-07-25 | 2011-12-21 | 周利庆 | Safe and energy-saving air heating device without air duct resistance |
| CN104990063A (en) * | 2015-06-24 | 2015-10-21 | 山东英电节能科技有限公司 | Hot primary air waste heat utilization device coupled with air heater system in use |
| CN113280507A (en) * | 2021-06-22 | 2021-08-20 | 西安热工研究院有限公司 | Optimal heat source determining system and method for multi-heat-source air heater under variable working condition |
-
2011
- 2011-07-25 CN CN201120263493XU patent/CN202216393U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102287912A (en) * | 2011-07-25 | 2011-12-21 | 周利庆 | Safe and energy-saving air heating device without air duct resistance |
| CN104990063A (en) * | 2015-06-24 | 2015-10-21 | 山东英电节能科技有限公司 | Hot primary air waste heat utilization device coupled with air heater system in use |
| CN113280507A (en) * | 2021-06-22 | 2021-08-20 | 西安热工研究院有限公司 | Optimal heat source determining system and method for multi-heat-source air heater under variable working condition |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120509 Termination date: 20150725 |
|
| EXPY | Termination of patent right or utility model |